<!--
@license
Copyright 2016 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../tf-imports/lodash.html">
<link rel="import" href="../tf-imports/d3.html">

<!--
tf-image-loader loads an individual image from the TensorBoard backend.

Right now it always loads the most recent image. We should add support in the
future for loading older images.
-->
<dom-module id="tf-image-loader">
  <template>
    <img
      id="img"
      src="[[imageUrl]]"
      on-error="reload">
    <style>
      :host {
        display: block;
        width: 100%;
        height: auto;
        position: relative;
      }

      img {
        image-rendering: pixelated;
        display: block;
        width: 100%;
        height: auto;
      }
    </style>
  </template>
  <script>
    Polymer({
      is: "tf-image-loader",
      properties: {
        colorScale: Object,
        imageUrl: String,
      },
      setVisibleSeries: function(runs) {
        // Do nothing.
      },
      setSeriesData: function(run, data) {
        var last = _.last(data);
        this.redraw(last.url);
      },
      redraw: function(newUrl) {
        var url = newUrl || this.imageUrl;
        this.imageUrl = ""; // Force redraw
        this.imageUrl = url;
      },
    });
  </script>
</dom-module>
